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水稻产量决定于单位面积实粒数与粒重。前者受环境影响变化大，又受亩穗数与每穗实粒数所左右，也就是与群体的数量和质量密切相关。群体由个体组成，群体数量可用单位面积茎蘖数或叶面积系数表示，群体质量由个体质量所决定，单茎叶面积大，干重高的个体，一定比较粗壮，穗大
The yield of rice is determined by the number of grains per unit area and grain weight per unit area. The former is greatly affected by environmental changes and is affected by the number of ears per acre and the number of grains per ear. That is, it is closely related to the quantity and quality of the population. The population is composed of individuals. The population can be expressed as the number of tillers per unit area or the leaf area coefficient. The quality of the population is determined by the individual quality. Individuals with a large single stem and leaf area and high dry weight must be relatively thick and large